Phthalic Anhydride (PA)

The primary use of phthalic anhydride (PA) is as a chemical intermediate in the production of plastics from vinyl chloride. Phthalate esters, which function as plasticizers, are derived from phthalic anhydride. Phthalic anhydride is also used in the production of alkyd resins and polyester resins which are further used in paints and lacquers, certain dyes (anthraquinone, phthalein, rhodamine, phthalocyanine, fluorescein, and xanthene dyes), insect repellents, and urethane polyester polyols. It is also used as a rubber scorch inhibitor and retarder.

Principal Properties: Clear, Almost Colorless, Viscous Liquid. Mild Odour, Insoluble in water, Readily Soluble in Organic Solvents.
Application: Versatile Plasticizer, Used in Plasticizing Poly Vinyl Chloride (PVC), Binder in Paints, Pigmented and Unpigmented Lacquers and for Grinding Pigments.
Derivation : Esterification of Phthalic Anhydride and 2-Ethyl Hexanol.
Solubility : Alcohol, Ketones, Halogenated hydrocarbons, Aromatic hydrocarbons.